CC2500_06 Datasheet, PDF (73/84 Pages) Texas Instruments – Single Chip Low Cost Low Power RF Transceiver

CC2500
0x22: FREND0 – Front end TX configuration
Bit Field Name
Reset R/W Description
7:6 Reserved
5:4 LODIV_BUF_CURRENT_TX[1:0]
3 Reserved
2:0 PA_POWER[2:0]
1 (01)
R0
R/W
R0
0 (000) R/W
Adjusts current TX LO buffer (input to PA). The value to use in
this field is given by the SmartRF^® Studio software.
Selects PA power setting. This value is an index to the
PATABLE, which can be programmed with up to 8 different PA
settings. The PATABLE settings from index ‘0’ to the
PA_POWER value are used for power ramp-up/ramp-down at
the start/end of transmission in all TX modulation formats.
0x23: FSCAL3 – Frequency synthesizer calibration
Bit Field Name
Reset R/W Description
7:6 FSCAL3[7:6]
5:4 CHP_CURR_CAL_EN[1:0]
3:0 FSCAL3[3:0]
2 (10) R/W
2 (10) R/W
9
R/W
(1001)
Frequency synthesizer calibration configuration. The value to write in
this register before calibration is given by the SmartRF^® Studio
software.
Disable charge pump calibration stage when 0
Frequency synthesizer calibration result register.
Fast frequency hopping without calibration for each hop can be done
by calibrating upfront for each frequency and saving the resulting
FSCAL3, FSCAL2 and FSCAL1 register values. Between each
frequency hop, calibration can be replaced by writing the FSCAL3,
FSCAL2 and FSCAL1 register values corresponding to the next RF
frequency.
Bit Field Name
7:6 Reserved
5:0 FSCAL2[5:0]
0x24: FSCAL2 – Frequency synthesizer calibration
Reset R/W Description
R0
10
R/W
(0x0A)
Frequency synthesizer calibration result register.
Fast frequency hopping without calibration for each hop can be done
by calibrating upfront for each frequency and saving the resulting
FSCAL3, FSCAL2 and FSCAL1 register values. Between each
frequency hop, calibration can be replaced by writing the FSCAL3,
FSCAL2 and FSCAL1 register values corresponding to the next RF
frequency.
Bit Field Name
7:6 Reserved
5:0 FSCAL1[5:0]
0x25: FSCAL1 – Frequency synthesizer calibration
Reset R/W Description
R0
32
R/W Frequency synthesizer calibration result register.
(0x20)
Fast frequency hopping without calibration for each hop can be done
by calibrating upfront for each frequency and saving the resulting
FSCAL3, FSCAL2 and FSCAL1 register values. Between each
frequency hop, calibration can be replaced by writing the FSCAL3,
FSCAL2 and FSCAL1 register values corresponding to the next RF
frequency.
PRELIMINARY Data Sheet (Rev.1.2) SWRS040A
Page 73 of 83